Date: Sun, 03 Jun 2001 00:04:55 +0900 (JST) From: Hajimu UMEMOTO <ume@mahoroba.org> To: mdavis@cts.com Cc: freebsd-stable@freebsd.org, security@freebsd.org, wollman@FreeBSD.org, gad@FreeBSD.org Subject: Re: lpd: Malformed from address Message-ID: <20010603.000455.78786804.ume@mahoroba.org> In-Reply-To: <000001c0eb56$6d6ae250$241978d8@cts.com> References: <000001c0eb56$6d6ae250$241978d8@cts.com>
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>>>>> On Sat, 2 Jun 2001 04:23:18 -0700
>>>>> "Morgan Davis" <mdavis@cts.com> said:
mdavis> After upgrading two different FreeBSD 4.2 systems to 4.3, they both
mdavis> began to exhibit trouble when trying to print to their lpd processes.
mdavis> Watching the raw traffic via tcpdump, both are failing immediately when
mdavis> lpd tries to resolve the connecting client's address in chkhost():
mdavis> error = getnameinfo(f, f->sa_len, NULL, 0, serv, sizeof(serv),
mdavis> NI_NUMERICSERV);
mdavis> if (error || atoi(serv) >= IPPORT_RESERVED)
mdavis> fatal(0, "Malformed from address");
mdavis> It can be exercised via telnet:
mdavis> # telnet golf printer
mdavis> Trying 205.163.23.102...
mdavis> Connected to golf.cts.com.
mdavis> Escape character is '^]'.
mdavis> lpd: Malformed from address
mdavis> Connection closed by foreign host.
mdavis> This happens on both systems, different kernels, one running named and
mdavis> one not. What in the world could be causing this?
When I ported IPv6 support into FreeBSD from NetBSD, I wrongly brought
reserved port checking code into FreeBSD. Originally, FreeBSD's lpd
didn't check validity of connection by checking if it comes from
reserved port.
However, since lpd relies on r-authentication, it should be expected.
Though it is easy to get rid of reserved port checking, we should have
some considerlation. Any suggestion?
--
Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
ume@mahoroba.org ume@bisd.hitachi.co.jp ume@{,jp.}FreeBSD.org
http://www.imasy.org/~ume/
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